Apparatus for non-polarity correction and displacement measurement of object using search coil type sensor

ABSTRACT

An apparatus for correcting non-polarity and measuring displacement of an object using a search-coil type sensor includes a plurality of sensors that include respective housings having respective inner spaces, respective cores formed to be inserted into the inner spaces of the housings, and respective coils which are each wound around a portion of an outer circumferential surface of each of the housings, the portion corresponding to a position of each of the cores. The plurality of sensors are arranged in parallel with each other. A position of a core and a coil with respect to one housing differs from a position of a core and a coil with respect to another housing. An induced magnetic field is formed due to a distance change with respect to the object containing iron (Fe).

TECHNICAL FIELD

The present invention relates to an apparatus for correcting non-polarity and measuring displacement of an object using a search-coil type sensor and more specifically, to a technology for inhibiting a detection delay due to a range (non-polarity range) in which a magnetic field temporarily subsides during a change in pole with respect to a sensor based on the occurrence of displacement of an object containing iron, and for measuring a location, displacement, or the like of the object containing iron.

BACKGROUND ART

Various technologies of SQUID, Fiber-Optic, Flux-Gate, Magnetic Impedance, or the like are applied to magnetic sensors, and the magnetic sensors are highly advanced to be applied to respective industrial fields which demand such technologies. In particular, as the Fourth Industrial Revolution era arrives, various IoT products are launched, and thus an application range of the magnetic sensor technology is expanded to an area of everyday life.

Accordingly, Samsung Electro-Mechanics in Korea, Honeywell International Inc.as a multinational conglomerate corporation, and the like have each developed a magnetic sensor in a more compact chip shape and have invested in a variety of research and development for improving a sensing sensitivity or range and reducing a sensing error.

Korean Patent Registration No. 10-0867375 (Title of the Invention: Apparatus and Method for Measuring Information of Location and Direction of Moving Object Using Three Magnetic Field Sensors) discloses a method including an installation step of installing two magnetic field sensors corresponding to a surface formed by x and y axes, respectively, to a moving object and installing a magnetic field sensor corresponding to a z axis to the moving object, a storing step of measuring the earth's magnetic field corresponding to x, y, and z axes and storing information values of a reference magnetic field in an internal memory in the moving object, a determining step of causing the moving object to measure magnitudes of a magnetic field on x, y, and z axes while the moving object moves and then determining whether or not an absolute value of a difference between a measured Z-axis magnetic field value and a Z-axis reference magnetic field value is smaller than an error range set in a magnetic field sensor, and an updating step of updating a direction information value of the moving object by using measured x- and y-axes magnetic field values, when determination in the determining step is that the absolute value of the difference between the measured Z-axis magnetic field value and the reference value is smaller than the error range of the sensor.

CITATION LIST Patent Literature

-   Korean Patent Registration No. 10-0867375

SUMMARY OF INVENTION Technical Problem

An object of the present invention is to enable a location, displacement, or the like of an object to be detected using a fine magnetic field of the object containing iron without causing any change to a core and a coil which do not have any magnetic component.

In addition, another object of the present invention is to inhibit a detection delay due to a range (non-polarity range) in which a magnetic field subsides temporarily during a change in pole with respect to a sensor due to displacement of an object containing iron.

Further, still another object of the present invention is to perform detection not only when displacement occurs to an object containing iron with respect to a fixed sensor but also when displacement occurs to the sensor.

Technical objects to be achieved by the present invention are not limited to the technical objects mentioned above, and the following description enables other unmentioned technical objects to be clearly understood by a person of ordinary skill in the art to which the present invention pertains.

Solution to Problem

The present invention to achieve the above-described objects has a configuration including: a plurality of sensors that include respective housings having respective inner spaces, respective cores formed to be inserted into the inner spaces of the housings, and respective coils which are each wound around a portion of an outer circumferential surface of each of the housings, the portion corresponding to a position of each of the cores. The plurality of sensors are arranged in parallel with each other. A position of a core and a coil with respect to one housing differs from a position of a core and a coil with respect to another housing. An induced magnetic field is formed due to a distance change with respect to the object containing iron (Fe).

In an embodiment of the present invention, one end of a coil provided in one sensor may be connected to one end of a coil provided in another sensor, and the other end of the coil provided in the one sensor may be connected to the other end of the coil provided in the other sensor.

In the embodiment of the present invention, the configuration may further include an impedance matching unit that is connected to lead wires connected to a plurality of the coils, respectively, and performs impedance matching; and an amplifier that is connected to the impedance matching unit and amplifies a fine current and voltage generated during an approach of the object to the sensors.

In the embodiment of the present invention, the configuration may further include a first control unit that is connected to the amplifier and analyzes a waveform of the amplified current and voltage; and a second control unit that is connected to the first control unit and analyzes a positional change of the object or the sensors.

The present invention to achieve the above-described objects has another configuration including: a sensor that includes a housing having an internal space, a plurality of cores formed to be inserted into the internal space of the housing, and a plurality of coils wound around respective portions of an outer circumferential surface of the housing, the portions corresponding to respective positions of the plurality of cores. The plurality of coils are arranged in series with each other. One core is formed to be separated from another core. An induced magnetic field is formed due to a distance change with respect to the object containing iron (Fe).

In another embodiment of the present invention, one end of one coil of the plurality of coils may be connected to one end of another coil, and the other end of the one coil may be connected to the other end of the other coil.

In the other embodiment of the present invention, the configuration may further include an impedance matching unit that is connected to lead wires connected to the plurality of coils, respectively, and that performs impedance matching; and an amplifier that is connected to the impedance matching unit and amplifies a fine current and voltage generated during an approach of the object to the sensor.

In the other embodiment of the present invention, the configuration may further include a first control unit that is connected to the amplifier and analyzes a waveform of the amplified current and voltage; and a second control unit that is connected to the first control unit and analyzes a positional change of the object or the sensor.

The present invention to achieve the above-described objects has still another configuration including: a plurality of sensors that include respective housings having respective inner spaces, respective cores formed to be inserted into the inner spaces of the housings, and respective coils which are each wound around a portion of an outer circumferential surface of each of the housings, the portion corresponding to a position of each of the cores. The plurality of sensors are radially arranged with each other. An induced magnetic field is formed due to a distance change with respect to the object containing iron (Fe).

In still another embodiment of the present invention, one end of a coil provided in one sensor may be connected to one end of a coil provided in another sensor, and the other end of the coil provided in the one sensor may be connected to the other end of the coil provided in the other sensor.

In still another embodiment of the present invention, the configuration may further include an impedance matching unit that is connected to lead wires connected to a plurality of the coils, respectively, and performs impedance matching; and an amplifier that is connected to the impedance matching unit and amplifies a fine current and voltage generated during an approach of the object to the sensors.

In still another embodiment of the present invention, the configuration may further include a first control unit that is connected to the amplifier and analyzes a waveform of the amplified current and voltage; and a second control unit that is connected to the first control unit and analyzes a positional change of the object or the sensors.

Advantageous Effects of Invention

According to the above-described configuration, the present invention is effective in that a fine change in magnetic field and flux quantity of an object containing iron can be detected such that a position, displacement, or the like of the object containing iron can be detected with ultra-low electric power.

In addition, the present invention is effective in that, even when a range (non-polarity range) in which a magnetic field subsides temporarily is formed during a change in pole with respect to a sensor due to displacement of an object containing iron, a magnetic field of the object containing iron can be detected by another adjacent sensor or coil such that the apparatus can be normally and continuously operated.

In addition, the present invention is effective in that detection and measurement can be performed regardless of disposition of the apparatus for correcting non-polarity and measuring displacement of the present invention.

Further, the present invention is effective in that, since a fine change in magnetic field and flux quantity of an object containing iron can be detected, the apparatus can exhibit the same performance regardless of an effect of air, soil, water, or the like.

The effects of the present invention are construed not to be limited to the above-described effects but to include every effect that can be derived from the configurations of the present invention described in Description of Embodiments or Claims of the present invention.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic diagram illustrating a sensor according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating an apparatus for correcting non-polarity and measuring displacement according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram illustrating a sensor according to a second embodiment of the present invention.

FIG. 4 is a schematic diagram illustrating an apparatus for correcting non-polarity and measuring displacement according to the second embodiment of the present invention.

FIG. 5 is a schematic diagram illustrating magnetic field regions of the sensors according to the embodiments of the present invention.

FIG. 6 is a schematic diagram illustrating a sensor according to a third embodiment of the present invention.

FIG. 7 is a schematic diagram illustrating an apparatus for correcting non-polarity and measuring displacement according to the third embodiment of the present invention.

FIG. 8 is a schematic diagram illustrating an apparatus for correcting non-polarity and measuring displacement according to a fourth embodiment of the present invention.

FIGS. 9 and 10 illustrate signal pattern graphs obtained in a state where an object passes by the sensor according to the first embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

The preferred embodiment according to the present invention includes a plurality of sensors that include respective housings having respective inner spaces, respective cores formed to be inserted into the inner spaces of the housings, and respective coils which are each wound around a portion of an outer circumferential surface of each of the housings, the portion corresponding to a position of each of the cores. The plurality of sensors are arranged in parallel with each other. A position of a core and a coil with respect to one housing differs from a position of a core and a coil with respect to another housing. An induced magnetic field is formed due to a distance change with respect to the object containing iron (Fe).

Embodiments

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention can be realized as various different examples, and thus is not limited to embodiments described here. Further, a part irrelevant to the description is omitted from the drawings in order to clearly describe the present invention, and similar reference signs are assigned to similar parts through the entire specification.

In the entire specification, a case where a certain part “is connected to (accesses, is in contact with, or is coupled to)” another part means not only a case where the parts are “directly connected” to each other, but also a case where the parts are “indirectly connected” to each other with another member interposed therebetween. In addition, when a certain part “comprises” a certain configurational element, this doesn't mean that another configurational element is excluded, but the certain configurational element can be further included unless specifically described otherwise.

Terms used in this specification are only used to describe a specific embodiment and are not intentionally used to limit the present invention. A word having a singular form also includes a meaning of its plural form unless obviously implied otherwise in context. In this specification, a term such as “to comprise” or “to have” is construed to specify that a feature, a number, a step, an operation, a configurational element, a part, or combinations thereof described in the specification is present and not to exclude presence or a possibility of addition of one or more other features, numbers, steps, operations, configurational elements, parts, or combinations thereof in advance.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram illustrating a sensor 10 according to a first embodiment of the present invention, and FIG. 2 is a schematic diagram illustrating an apparatus for correcting non-polarity and measuring displacement according to the first embodiment of the present invention. In addition, FIG. 3 is a schematic diagram illustrating a sensor 10 according to a second embodiment of the present invention, and FIG. 4 is a schematic diagram illustrating an apparatus for correcting non-polarity and measuring displacement according to the second embodiment of the present invention. Further, FIG. 5 is a schematic diagram illustrating magnetic field regions of the sensors 10 according to the embodiments of the present invention. Here, (a) of FIG. 5 is a diagram illustrating a state where an object 60 containing iron (Fe) moves with respect to the apparatus for correcting non-polarity and measuring displacement according to the first embodiment of the present invention, and (b) of FIG. 5 is a diagram illustrating a state where the object 60 containing iron (Fe) moves with respect to the apparatus for correcting non-polarity and measuring displacement according to the second embodiment of the present invention. Directions can be set based on right, left, top, and bottom of the drawings. Hereinafter, the same is true of the following. In the drawings of the present invention, the object 60 containing iron has marks of the N pole and the S pole; however, the marks are only provided for the convenience of understanding, and the marks do not indicate that the object is a magnet or an electromagnet.

First, the apparatus for correcting non-polarity and measuring displacement according to the first embodiment of the present invention is to be described.

As illustrated in FIGS. 1 and 2 , the apparatus for correcting non-polarity and measuring displacement of the present invention includes a plurality of sensors 10 that include respective housings 300 having respective inner spaces, respective cores 100 formed to be inserted into the inner spaces of the housings 300, and respective coils 200 which are each wound around a portion of an outer circumferential surface of each of the housings 300, the portion corresponding to a position of each of the cores 100.

Here, in the apparatus for correcting non-polarity and measuring displacement of the present invention, an induced magnetic field can be formed due to a distance change with respect to the object 60 containing iron (Fe). The object 60 containing iron (Fe) can form a fine magnetic field due to a property of the iron (Fe) having magnetism, and the induced magnetic field can be formed in the sensor 10 due to a movement or direction change of the object 60 containing iron (Fe).

Specifically, the core 100 does not contain any magnetic component, and the induced magnetic field can be formed in the sensor 10 due to an approach or separation of the magnetic field of the object 60 containing iron. Further, the generation of the induced magnetic field can cause a fine current and voltage to be generated in the coil 200. That is, the configuration described above enables a magnetic flux quantity having an effect on the core 100 to be detected whenever a location or a direction of the object 60 containing iron (Fe) is changed, even when the core 100 is affected by a nano scale of flux quantity from the object 60 containing iron (Fe) or a magnetic field formed by the object 60 containing iron (Fe) has a magnetic flux density of equal to or smaller than several milligauss.

In order to fulfil a function described above, the core 100 can have good hysteresis characteristics and relatively high permeability. Specifically, in order to form the core 100, metal powder is mixed in proportion of 4.6 to 5.2 wt. % of iron (Fe), 74.3 to 75.6 wt. % of nickel (Ni), 12.5 to 13 wt. % of silicon (Si), 1.5 to 1.6 wt. % of chromium (Cr), and 5.8 to 5.9 wt. % of cobalt (Co) and is molded through the injection molding at a temperature of 1,300° C. or higher into a ribbon (or tape) shape having a thickness of 0.025 mm or smaller considering the permeability and impact having an effect on remote sensing, and a thin and lightweight core can be obtained. In addition, a plurality of thin cores 100 formed as described above can be configured to be overlapped and integrated with each other.

Here, since a nickel content accounts for a significant percent by weight in the core 100, it is important for nickel to be inhibited from dissolving at a low temperature. In addition, since a magnetic characteristic (hysteresis) of cobalt is degraded at a temperature of 1,200 to 1,300° C., it is important to perform the injection molding at a temperature lower than 1,300° C. In addition, since the injection molding is vulnerable to impact, the injection molding has to be performed at a low injection speed and quenched at 106° C./sec such that the core 100 can have durability.

When a plurality of types of metal powder are mixed as described above, the mixed powder is heterogeneous, and thus particles can be arranged by providing a strong magnetic field while a heat treatment of heating the particles at a certain temperature is performed until the particles dissolve, so as for the particles of the mixed powder to maintain an arranged state in a certain direction. In addition, in order for the particles to maintain the arranged state, the core 100 formed in a process described above can be gradually cooled while being located in a magnetic field to be subjected to a magnetic field process. Accordingly, the hysteresis and the permeability of the core 100 can be increased.

As the characteristics of the core 100 becomes better when the thickness is thinner and the core 100 has to be lightweight so as to withstand impact, the core 100 made of an amorphous type of or permalloy metal is preferable; however, the permalloy metal has a higher degree of change due to impact than the amorphous metal does, and thus it is possible to use the amorphous core 100 in the apparatus for correcting non-polarity and measuring displacement of the present invention.

The housing 300 can be formed into a cylindrical shape having an inner space, and the housing 300 can be made of an insulation material. In addition, the core 100 which is a passage of magnetic flux induced by the coil 200 can be formed in the inner space of the housing 300 corresponding to a position of the coil 200. Further, the coil 200 can be made of a metal wire such as an iron wire, a nichrome wire, or a copper wire.

As illustrated in FIGS. 1 and 2 , the plurality of sensors 10 can be arranged in parallel with each other, and a position of a core 100 and a coil 200 with respect to one housing 300 can differ from a position of a core 100 and a coil 200 with respect to another housing 300. Specifically, of the plurality of sensors 10, a 1-1st sensor 11 and a 1-2nd sensor 12 can be formed in parallel to be positioned side by side, a 1-1st core 111 and a 1-1st coil 211 can be formed at a right portion of the first sensor 10, and a 1-2nd core 112 and a 1-2nd coil 212 can be formed at a left portion of the second sensor 10.

As illustrated in FIGS. 1, 2, and 5 , when the object 60 containing iron (Fe) moves to approach the sensor 10 from the left side to the right side of the drawings, a change in magnetic field momentarily occurs in the core 100, and thus a fine voltage and current can be induced to be formed in the coil 200. In this case, when a non-polarity part (represented by Reference sign A in FIG. 5 ) as a part in which N pole and S pole of the object 60 containing iron (Fe) is switched passes by the 1-1st core 111, the generation of the voltage and the current induced by the 1-1st core 111 and the 1-1st coil 211 provided in the 1-1st sensor 11 can be stopped. Here, not only when a magnetic line of force does not affect the 1-1st core 111 and the 1-1st coil 211 at all due to the non-polarity part, but also when the magnetic line of force partially affects the 1-1st core 111 and the 1-1st coil 211 as illustrated in FIG. 5 , the magnetic flux density can be remarkably reduced in the vicinity of the non-polarity part such that generation of an induced voltage and current can be stopped.

On the other hand, at the same time, since the 1-2nd core 112 and the 1-2nd coil 212 provided in the 1-2nd sensor 12 are affected by distortion of a magnetic field through the N or S pole which is generated by the object 60 containing iron (Fe), that is, affected by magnetic field movement of the object 60 containing iron (Fe), a fine voltage and current can be induced in the 1-2nd coil 212.

Further, one end of a coil 200 provided in one sensor 10 can be connected to one end of a coil 200 provided in another sensor 10, and the other end of the coil 200 provided in the one sensor 10 can be connected to the other end of the coil 200 provided in the other sensor 10. Accordingly, a lead wire of the one sensor 10 and a lead wire of the other sensor 10 can be connected to have the same signal.

Specifically, when an induced magnetic field is generated to the core 100 and the coil 200 (the 1-1st core 111 and the 1-1st coil 211) provided in the one sensor 10 and the core 100 and the coil 200 (the 1-2nd core 112 and the 1-2nd coil 212) provided in the other sensor 10, a fine current and voltage can be generated in the coil 200 provided in the one sensor 10 such that a +pole and a −pole can be formed therein, and similarly, a fine current and voltage can be formed in the coil 200 provided in the other sensor 10 such that a +pole and a −pole can be formed therein. In this case, the +pole of the coil 200 provided in the one sensor 10 can be connected to the +pole of the coil 200 provided in the other sensor 10, and the −pole of the coil 200 provided in the one sensor 10 can be connected to the −pole of the coil 200 provided in the other sensor 10.

Even when the non-polarity part of the object 60 containing iron (Fe) passes by one sensor 10 as described above and the generation of the current and the voltage is stopped in the coil 200 provided in the one sensor 10, the connection of the same signal as described above enables the current and the voltage to be generated in the coil 200 provided in the other sensor 10 such that the sensor 10 can be continuously and normally operated.

The apparatus for correcting non-polarity and measuring displacement of the present invention can further include: an impedance matching unit 20 that is connected to lead wires connected to a plurality of the coils 200, respectively, and performs impedance matching; and an amplifier 30 that is connected to the impedance matching unit 20 and amplifies the fine current and voltage generated during an approach of the object 60 to the sensors 10. The impedance matching unit 20 can maximize a signal transmission efficiency by reducing a loss of signal by reducing reflection due to an impedance difference between signals (fine current or voltage) transmitted from both ends of each of the sensors 10. Further, the amplifier 30 can include an amplification circuit for amplifying a transmitted signal, amplify the signal transmitted from the impedance matching unit 20, and transmit the amplified signal to the first control unit 41.

The apparatus for correcting non-polarity and measuring displacement of the present invention can further include: a first control unit 41 that is connected to the amplifier 30 and analyzes a waveform of the amplified current and voltage; and a second control unit 42 that is connected to the first control unit 41 and analyzes a positional change of the object 60 or the sensors 10. Specifically, the first control unit 41 can determine whether displacement occurred to the object 60 containing iron (Fe) or displacement occurred to the sensors 10 by analyzing a waveform of an amplified signal.

The first control unit 41 can be realized by a signal processing module such as a microcomputer or an FPGA, and a software algorithm (SW algorithm) can be applied thereto. The SW algorithm can determine whether the displacement occurred to the object 60 containing iron (Fe), the sensors 10, or both the object and the sensors based on whether information of a signal pattern obtained during the occurrence of displacement to the sensors 10 and a signal pattern obtained during movement of the object 60 containing iron (Fe) is different.

Specifically, since the sensors 10 respond to a fine magnetic field, in a case where the displacement occurred to the sensor 10, the signal pattern can be formed by being affected by a change in magnetic field of the Earth, magnetic field of another object 60 around the sensor, or the like, in addition to a magnetic field change due to the occurrence of relative displacement of the sensor 10 with respect to the object 60 containing iron (Fe), while in a case where the displacement occurred to the object 60 containing iron (Fe), the sensor 10 is affected only by a change in magnetic field due to the occurrence of the relative displacement with respect to the object 60 containing iron (Fe). Hence, different signal patterns can be formed depending on both the cases. Further, similarly, in a case where displacement occurred to the object 60 containing iron (Fe) and the sensors 10 simultaneously, another signal pattern can be formed.

As described above, different signal pattern can be formed depending on cases, and the signal patterns formed for each cases can be stored in the first control unit 41 and form reference data. Here, the signal pattern stored in the reference data of the first control unit 41 can be experimentally derived. The first control unit 41 can analyze similarity or the like by determining through comparison between a signal pattern transmitted from the amplifier 30 and the signal pattern in the reference data of the first control unit 41, thereby performing determination of whether the displacement occurred to the object 60 containing iron (Fe) or the sensors 10.

The second control unit 42 can receive, from the first control unit 41, information of whether the displacement occurred to the object 60 containing iron (Fe) or the displacement occurred to the sensors 10 and data of a waveform of the signal pattern and analyze an actual displacement path of a displaced agent. The second control unit 42 can be realized by a signal processing module such as a microcomputer or an FPGA, and a software algorithm (SW algorithm) can be applied thereto.

Specifically, the signal pattern for the occurrence of displacement of the object 60 containing iron (Fe), the signal pattern for the occurrence of displacement of the sensors 10, or the signal pattern for the simultaneous occurrence of displacement of the object 60 containing iron (Fe) and the sensors 10 can be all stored in the second control unit 42 and form reference data. Here, the signal patterns stored in the reference data of the second control unit 42 can be experimentally derived.

The second control unit 42 can first confirm a displaced agent based on the information transmitted from the first control unit 41, select a data category related to a displaced agent from the reference data of the second control unit 42, and then analyze similarity by determining through comparison between the waveform of the signal pattern transmitted from the first control unit 41 and the signal pattern in the reference data of the second control unit 42, thereby, performing a coordinate change based on the occurrence of the displacement of the object 60 containing iron (Fe), a coordinate change based on the occurrence of the displacement of the sensors 10, or the like.

In the embodiment of the present invention, the first control unit 41 and the second control unit 42 are described to be sequentially connected to each other; however, connection thereof is not limited thereto, and the first control unit 41 and the second control unit 42 can be configured simultaneously or independently.

The apparatus for correcting non-polarity and measuring displacement of the present invention can further include an output unit 50 that is connected to the first control unit 41 or the second control unit 42 and visually outputs a positional change of the object 60 containing iron (Fe) or the sensors 10. The output unit 50 can receive information from the first control unit 41 and the second control unit 42, can display whether the displaced agent is the object 60 containing iron (Fe) or the sensors 10, and can also display a three-dimensional coordinate change of the displaced agent on a graph, an image, or the like.

Hereinafter, an apparatus for correcting non-polarity and measuring displacement according to a second embodiment of the present invention is to be described.

As illustrated in FIGS. 3 and 4 , the apparatus for correcting non-polarity and measuring displacement of the present invention includes a sensor 10 that includes a housing 300 having an inner space, a plurality of cores 100 formed to be inserted into the inner space of the housing 300, and a plurality of coils 200 wound around respective portions of an outer circumferential surface of the housing 300, the portions corresponding to respective positions of the plurality of cores 100.

Here, in the apparatus for correcting non-polarity and measuring displacement of the present invention, an induced magnetic field can be formed due to a distance change with respect to the object 60 containing iron (Fe). The description of a principle of forming the induced magnetic field, forming of the core 100, or the like is the same as the description provided for the first embodiment of the apparatus for correcting non-polarity and measuring displacement of the present invention.

As illustrated in FIGS. 3 and 4 , the plurality of coils 200 can be arranged in series with each other, and one core 100 can be formed to be separated from another core 100. Specifically, a 2-1st coil 221 and a 2-2nd coil 222 can be formed in series at one housing 300, and a 2-1st core 121 and a 2-2nd core 122 can be formed to correspond to the coils.

As illustrated in FIGS. 3, 4, and 5 , when the object 60 containing iron (Fe) moves to approach the sensor 10 from the left side to the right side of the drawings, a change in magnetic field momentarily occurs in the core 100, and thus a fine voltage and current can be induced to be formed in the coil 200. In this case, when a non-polarity part (represented by Reference sign A in FIG. 5 ) as a part in which N pole and S pole of the object 60 containing iron (Fe) is switched passes by the 2-1st core 121, the generation of the voltage and the current induced by the 2-1st core 121 and the 2-1st coil 221 can be stopped. Here, not only when a magnetic line of force does not affect the 2-1st core 121 and the 2-1st coil 221 at all due to the non-polarity part, but also when the magnetic line of force partially affects the 2-1st core 121 and the 2-1st coil 221 as illustrated in FIG. 5 , the magnetic flux density can be remarkably reduced in the vicinity of the non-polarity part such that generation of an induced voltage and current can be stopped.

On the other hand, at the same time, since the 2-2nd core 122 and the 2-2nd coil 222 are affected by distortion of a magnetic field through the N or S pole which is generated by the object 60 containing iron (Fe), that is, affected by magnetic field movement of the object 60 containing iron (Fe), a fine voltage and current can be induced in the 2-2nd coil 222.

Further, one end of one coil 200 of the plurality of coils 200 can be connected to one end of another coil 200, and the other end of the one coil 200 can be connected to the other end of the other coil 200. Accordingly, a lead wire of the one coil 200 and a lead wire of the other coil 200 can be connected to have the same signal.

Specifically, when an induced magnetic field is generated to one coil 200 (2-1st coil 221) and another coil 200 (2-2nd coil 222), a fine current and voltage can be formed in the one coil 200 such that a +pole and a −pole can be formed therein, and similarly, a fine current and voltage can be formed in the other coil 200 such that a +pole and a −pole can be formed therein. In this case, the +pole of the one coil 200 can be connected to the +pole of the other coil 200, and the −pole of the one coil 200 can be connected to the −pole of the other coil 200.

Even when the non-polarity part of the object 60 containing iron (Fe) passes by one sensor 10 as described above and the generation of the current and the voltage is stopped in the coil 200 provided in the one sensor 10, the connection of the same signal as described above enables the current and the voltage to be generated in the coil 200 provided in the other sensor 10 such that the sensor 10 can be continuously and normally operated.

The apparatus for correcting non-polarity and measuring displacement of the present invention can further include: an impedance matching unit 20 that is connected to lead wires connected to a plurality of the coils 200, respectively, and performs impedance matching; and an amplifier 30 that is connected to the impedance matching unit 20, amplifies the fine current and voltage generated during an approach of the object 60 to the sensor 10, and supplies electricity to the coils 200. The impedance matching unit 20 can maximize a signal transmission efficiency by reducing a loss of signal by reducing reflection due to an impedance difference between signals (fine current or voltage) transmitted from both ends of each of the coils 200. Further, the amplifier 30 can include an amplification circuit for amplifying a transmitted signal, amplify the signal transmitted from the impedance matching unit 20, and transmit the amplified signal to the first control unit 41.

The apparatus for correcting non-polarity and measuring displacement of the present invention can further include: a first control unit 41 that is connected to the amplifier 30 and analyzes a waveform of the amplified current and voltage; and a second control unit 42 that is connected to the first control unit 41 and analyzes a positional change of the object 60 or the sensors 10. The apparatus for correcting non-polarity and measuring displacement of the present invention can further include an output unit 50 that is connected to the first control unit 41 or the second control unit 42 and visually outputs a positional change of the object 60 containing iron (Fe) or the sensors 10. Here, the description of the first control unit 41, the second control unit 42, and the output unit 50 of the apparatus for correcting non-polarity and measuring displacement according to the second embodiment of the present invention is the same as the description of the first control unit 41, the second control unit 42, and the output unit 50 of the apparatus for correcting non-polarity and measuring displacement according to the first embodiment of the present invention described above.

In the embodiments of the present invention, the parallel arrangement of the sensors 10 as in the apparatus for correcting non-polarity and measuring displacement according to the first embodiment of the present invention is described to be distinguished from the series arrangement of the coils 200 in the single sensor 10 of the apparatus for correcting non-polarity and measuring displacement according to the second embodiment of the present invention. However, the apparatus for correcting non-polarity and measuring displacement of the present invention can be formed to include a plurality of sensors 10 in which the coils 200 are arranged in series in one sensor 10, with the sensors 10 being arranged in parallel, and the coils 200 are provided at different respective positions with respect to each of the sensors 10 so as to inhibit an effect of the non-polarity part of the object 60 containing iron (Fe). When the apparatus for correcting non-polarity and measuring displacement of the present invention is formed as described above, the above-described configuration and principle can be similarly applied thereto.

Hereinafter, an apparatus for correcting non-polarity and measuring displacement according to a third embodiment of the present invention is to be described. FIG. 6 is a schematic diagram illustrating a sensor according to the third embodiment of the present invention, and FIG. 7 is a schematic diagram illustrating the apparatus for correcting non-polarity and measuring displacement according to the third embodiment of the present invention. Further, FIG. 8 is a schematic diagram illustrating an apparatus for correcting non-polarity and measuring displacement according to a fourth embodiment of the present invention. In FIGS. 6 and 8 , regions enclosed by two-dot chain lines may indicate measurable regions (ranges) of the sensors 10 corresponding to the respective regions.

In FIGS. 6 and 8 , for the convenience of understanding, the measurable regions of the sensors 10 are illustrated to be rather small; however, the measurable region is not limited thereto, and the measurable regions of the sensors 10 can be formed to be larger. Further, in FIG. 8 , for the convenience of understanding, connection or the like of lead wires is omitted, and only arrangement of the sensors 10 is illustrated.

As illustrated in FIGS. 6 to 8 , the apparatus for correcting non-polarity and measuring displacement of the present invention includes a plurality of sensors 10 that include respective housings 300 having respective inner spaces, respective cores 100 formed to be inserted into the inner spaces of the housings 300, and respective coils 200 which are each wound around a portion of an outer circumferential surface of each of the housings 300, the portion corresponding to a position of each of the cores 100.

Here, in the apparatus for correcting non-polarity and measuring displacement of the present invention, an induced magnetic field can be formed due to a distance change with respect to the object 60 containing iron (Fe). The description of a principle of forming the induced magnetic field, forming of the core 100, or the like is the same as the description provided for the first embodiment of the apparatus for correcting non-polarity and measuring displacement of the present invention.

As illustrated in FIGS. 6 to 8 , the plurality of sensors 10 can be radially arranged.

Specifically, of the plurality of sensors 10, a 3-1st sensor 13 and a 3-2nd sensor 14 can be radially formed (other sensors are also radially formed; however, for the convenience of understanding, only the 3-1st sensor 13 and the 3-2nd sensor 14, to which Reference signs are assigned, are to be described.).

As described above, when the plurality of sensors 10 are radially arranged, the measurable regions of the plurality of sensors 10 can be formed to be contiguous to each other or to intersect with each other such that the detection efficiency of the object by the apparatus for correcting non-polarity and measuring displacement of the present invention can be remarkably improved. In particular, as illustrated in FIG. 8 , when the plurality of sensors 10 are arranged in a three-dimensionally radial shape, the measurable regions of the plurality of sensors 10 can be formed into spherical shapes. Hence, not only can the detection efficiency be increased as described above, but also an advantage of easy detection of the object can be obtained even when the object moves toward any of an x axis, a y axis, and a z axis. Further, when the sensors 10 are separately disposed from each other, arrangement with consideration for the measurable regions of the sensors 10 may not be easy. However, when the apparatus for correcting non-polarity and measuring displacement of the present invention which is formed as described above, in which the plurality of sensors 10 are radially arranged, is used, the measurable region can be formed into a cylindrical or spherical shape, and thereby the measurable regions can be easily calculated such that detection region design of the object can be easily performed.

As illustrated in FIGS. 6 to 8 , when the object 60 containing iron (Fe) moves to approach the sensor 10 from the left side to the right side of the drawings, a change in magnetic field momentarily occurs in the core 100, and thus a fine voltage and current can be induced and formed in the coil 200. In this case, when the non-polarity part as a part in which N pole and S pole of the object 60 containing iron (Fe) is switched passes by a 3-1st core 131, the generation of the voltage and the current induced by the 3-1st core 131 and a 3-1st coil 231 provided in the 3-1st sensor 13 can be stopped. Here, not only when a magnetic line of force does not affect the 3-1st core 131 and the 3-1st coil 231 at all due to the non-polarity part, but also when the magnetic line of force partially affects the 3-1st core 131 and the 3-1st coil 231, the magnetic flux density can be remarkably reduced in the vicinity of the non-polarity part such that generation of an induced voltage and current can be stopped.

On the other hand, at the same time, since the 3-2nd core 132 and the 3-2nd coil 232 provided in the 3-2nd sensor 14 are affected by distortion of a magnetic field through the N or S pole which is generated by the object 60 containing iron (Fe), that is, affected by magnetic field movement of the object 60 containing iron (Fe), a fine voltage and current can be induced in the 3-2nd coil 232.

Further, one end of a coil 200 provided in one sensor 10 can be connected to one end of a coil 200 provided in another sensor 10, and the other end of the coil 200 provided in the one sensor 10 can be connected to the other end of the coil 200 provided in the other sensor 10. Accordingly, a lead wire of the one sensor 10 and a lead wire of the other sensor 10 can be connected to have the same signal.

Specifically, when an induced magnetic field is generated to the core 100 and the coil 200 (the 3-1st core 131 and the 3-1st coil 231) provided in the one sensor 10 and the core 100 and the coil 200 (the 3-2nd core 132 and the 3-2nd coil 232) provided in the other sensor 10, a fine current and voltage can be generated in the coil 200 provided in the one sensor 10 such that a +pole and a −pole can be formed therein, and similarly, a fine current and voltage can be formed in the coil 200 provided in the other sensor 10 such that a +pole and a −pole can be formed therein. In this case, the +pole of the coil 200 provided in the one sensor 10 can be connected to the +pole of the coil 200 provided in the other sensor 10, and the −pole of the coil 200 provided in the one sensor 10 can be connected to the −pole of the coil 200 provided in the other sensor 10.

Even when the non-polarity part of the object 60 containing iron (Fe) passes by one sensor 10 as described above and the generation of the current and the voltage is stopped in the coil 200 provided in the one sensor 10, the connection of the same signal as described above enables the current and the voltage to be generated in the coil 200 provided in the other sensor 10 such that the sensor 10 can be continuously and normally operated.

The apparatus for correcting non-polarity and measuring displacement of the present invention can further include: an impedance matching unit 20 that is connected to lead wires connected to a plurality of the coils 200, respectively, and performs impedance matching; and an amplifier 30 that is connected to the impedance matching unit 20, amplifies the fine current and voltage generated during an approach of the object 60 to the sensor 10, and supplies electricity to the coils 200. The impedance matching unit 20 can maximize a signal transmission efficiency by reducing a loss of signal by reducing reflection due to an impedance difference between signals (fine current or voltage) transmitted from both ends of each of the coils 200. Further, the amplifier 30 can include an amplification circuit for amplifying a transmitted signal, amplify the signal transmitted from the impedance matching unit 20, and transmit the amplified signal to the first control unit 41.

The apparatus for correcting non-polarity and measuring displacement of the present invention can further include: a first control unit 41 that is connected to the amplifier 30 and analyzes a waveform of the amplified current and voltage; and a second control unit 42 that is connected to the first control unit 41 and analyzes a positional change of the object 60 or the sensors 10. The apparatus for correcting non-polarity and measuring displacement of the present invention can further include an output unit 50 that is connected to the first control unit 41 or the second control unit 42 and visually outputs a positional change of the object 60 containing iron (Fe) or the sensors 10. Here, the description of the first control unit 41, the second control unit 42, and the output unit 50 of the apparatus for correcting non-polarity and measuring displacement according to the third embodiment of the present invention is the same as the description of the first control unit 41, the second control unit 42, and the output unit 50 of the apparatus for correcting non-polarity and measuring displacement according to the first embodiment of the present invention described above.

FIGS. 9 and 10 illustrate signal pattern graphs obtained in a state where the object passes by the sensor according to the first embodiment of the present invention. Specifically, (a) of FIG. 9 illustrates a graph obtained in a state where a single sensor 10 according to the first embodiment of the present invention is formed and a lengthwise axis of the sensor 10 is perpendicular to the ground, and (b) of FIG. 9 illustrates a graph obtained in a state where the sensors 10 according to the first embodiment of the present invention are arranged in parallel with each other and lengthwise axes of the sensors 10 are perpendicular to the ground. Further, (a) of FIG. 10 illustrates a graph obtained in a state where a single sensor 10 according to the first embodiment of the present invention is formed and a lengthwise axis of the sensor 10 is horizontal to the ground, and (b) of FIG. 10 illustrates a graph obtained in a state where the sensors 10 according to the first embodiment of the present invention are arranged in parallel with each other and lengthwise axes of the sensors 10 are horizontal to the ground.

As illustrated in FIGS. 9 and 10 , when the apparatus for correcting non-polarity and measuring displacement of the present invention is used, it can be confirmed that the detection of the object 60 by using the apparatus for correcting non-polarity and measuring displacement of the present invention is easily performed regardless of whether the lengthwise axis of the sensor 10 is perpendicular or horizontal to the ground. Further, as found in comparison between a case of using a single sensor 10 and a case of using the plurality of sensors 10 arranged in parallel with each other, when the apparatus for correcting non-polarity and measuring displacement of the present invention is used, the occurrence of displacement of the object 60 containing iron (Fe) can be normally and continuously measured regardless of the non-polarity part of the object 60 containing iron (Fe).

According to the above-described configuration, a fine change in magnetic field and flux quantity of the object 60 containing iron can be detected such that a position, displacement, or the like of the object 60 containing iron can be detected with ultra-low electric power. In addition, even when the non-polarity range as a range in which a magnetic field of the object 60 subsides is formed as described above, the magnetic field of the object 60 containing iron can be detected by another adjacent sensor 10 or coil 200 such that the apparatus for correcting non-polarity and measuring displacement can be normally and continuously operated. Further, as described above, an additional effect of an installation direction or the like of the sensor 10 with respect to the ground is minimized such that detection and measurement can be performed regardless of disposition of the apparatus for correcting non-polarity and measuring displacement of the present invention. Furthermore, since the apparatus for correcting non-polarity and measuring displacement of the present invention can detect a fine change in magnetic field and flux quantity of the object containing iron, the apparatus can exhibit the same performance regardless of an effect of air, soil, water, or the like.

The description of the present invention described above is provided as an example, and a person of ordinary skill in the art to which the present invention pertains can understand that it is possible to easily modify the present invention to still another embodiment without changing the technical idea or an essential feature of the present invention. Therefore, the embodiments described above need to be understood as exemplified embodiments in every aspect and not as limiting embodiments. For example, the configurational elements described in singular forms can be realized in a distributed manner. Similarly, the configurational elements described in a distributed manner may be realized in a combined manner.

The scope of the present invention needs to be construed by the claims below, and the meaning and the scope of the claims and every modified or altered embodiment derived from an equivalent concept of the claims need to be construed to belong to the scope of the present invention.

REFERENCE SIGNS LIST

10: Sensor

11: 1-1st Sensor

12: 2-2nd Sensor

13: 3-1st Sensor

14: 3-2nd Sensor

20: Impedance Matching Unit

30: Amplifier

41: First Control Unit

42: Second Control Unit

50: Output Unit

60: Object

100: Core

111: 1-1st Core

112: 1-2nd Core

121: 2-1st Core

122: 2-2nd Core

131: 3-1st Core

132: 3-2nd Core

200: Coil

211: 1-1st Coil

212: 1-2nd Coil

221: 2-1st Coil

222: 2-2nd Coil

231: 3-1st Coil

232: 3-2nd Coil

300: Housing 

1. An apparatus for correcting non-polarity and measuring displacement of an object using a search-coil type sensor, the apparatus comprising: a plurality of sensors that include respective housings having respective inner spaces, respective cores formed to be inserted into the inner spaces of the housings, and respective coils which are each wound around a portion of an outer circumferential surface of each of the housings, the portion corresponding to a position of each of the cores, wherein the plurality of sensors are arranged in parallel with each other, wherein a position of a core and a coil with respect to one housing differs from a position of a core and a coil with respect to another housing, and wherein an induced magnetic field is formed due to a distance change with respect to the object containing iron (Fe).
 2. The apparatus for correcting non-polarity and measuring displacement of an object using a search-coil type sensor according to claim 1, wherein one end of a coil provided in one sensor is connected to one end of a coil provided in another sensor, and the other end of the coil provided in the one sensor is connected to the other end of the coil provided in the other sensor.
 3. The apparatus for correcting non-polarity and measuring displacement of an object using a search-coil type sensor according to claim 1, further comprising: an impedance matching unit that is connected to lead wires connected to a plurality of the coils, respectively, and performs impedance matching; and an amplifier that is connected to the impedance matching unit and amplifies a fine current and voltage generated during an approach of the object to the sensors.
 4. The apparatus for correcting non-polarity and measuring displacement of an object using a search-coil type sensor according to claim 3, further comprising: a first control unit that is connected to the amplifier and analyzes a waveform of the amplified current and voltage; and a second control unit that is connected to the first control unit and analyzes a positional change of the object or the sensors.
 5. An apparatus for correcting non-polarity and measuring displacement of an object using a search-coil type sensor, the apparatus comprising: a sensor that includes a housing having an inner space, a plurality of cores formed to be inserted into the inner space of the housing, and a plurality of coils wound around respective portions of an outer circumferential surface of the housing, the portions corresponding to respective positions of the plurality of cores, wherein the plurality of coils are arranged in series with each other, wherein one core is formed to be separated from another core, and wherein an induced magnetic field is formed due to a distance change with respect to the object containing iron (Fe).
 6. The apparatus for correcting non-polarity and measuring displacement of an object using a search-coil type sensor according to claim 5, wherein one end of one coil of the plurality of coils is connected to one end of another coil, and the other end of the one coil is connected to the other end of the other coil.
 7. The apparatus for correcting non-polarity and measuring displacement of an object using a search-coil type sensor according to claim 5, further comprising: an impedance matching unit that is connected to lead wires connected to the plurality of coils, respectively, and performs impedance matching; and an amplifier that is connected to the impedance matching unit and amplifies a fine current and voltage generated during an approach of the object to the sensor.
 8. The apparatus for correcting non-polarity and measuring displacement of an object using a search-coil type sensor according to claim 7, further comprising: a first control unit that is connected to the amplifier and analyzes a waveform of the amplified current and voltage; and a second control unit that is connected to the first control unit and analyzes a positional change of the object or the sensor.
 9. An apparatus for correcting non-polarity and measuring displacement of an object using a search-coil type sensor, the apparatus comprising: a plurality of sensors that include respective housings having respective inner spaces, respective cores formed to be inserted into the inner spaces of the housings, and respective coils which are each wound around a portion of an outer circumferential surface of each of the housings, the portion corresponding to a position of each of the cores, wherein the plurality of sensors are radially arranged with each other, and wherein an induced magnetic field is formed due to a distance change with respect to the object containing iron (Fe).
 10. The apparatus for correcting non-polarity and measuring displacement of an object using a search-coil type sensor according to claim 9, wherein one end of a coil provided in one sensor is connected to one end of a coil provided in another sensor, and the other end of the coil provided in the one sensor is connected to the other end of the coil provided in the other sensor.
 11. The apparatus for correcting non-polarity and measuring displacement of an object using a search-coil type sensor according to claim 9, an impedance matching unit that is connected to lead wires connected to a plurality of the coils, respectively, and performs impedance matching; and an amplifier that is connected to the impedance matching unit and amplifies a fine current and voltage generated during an approach of the object to the sensors.
 12. The apparatus for correcting non-polarity and measuring displacement of an object using a search-coil type sensor according to claim 11, further comprising: a first control unit that is connected to the amplifier and analyzes a waveform of the amplified current and voltage; and a second control unit that is connected to the first control unit and analyzes a positional change of the object or the sensors. 